California Code, Financial Code - FIN § 8034

(a) If a new domestic association is formed during a fiscal year, the initial assessment provided for by this article shall be computed on the same basis as if such new association had been an association and assessed on or before the 20th day of June in the fiscal year preceding the initial assessment except that the initial assessment shall be based on the assets of the new association at the time of issuance of its certificate of authority and, except as provided in subdivision (b), the assessment shall be reduced, if the certificate of authority is not issued in July, by one-twelfth for each full month of the fiscal year which has expired at the time of issuance of the certificate of authority and shall be payable in full on the date of issuance.

(b) In the levy and collection of an assessment under this article, no association shall be assessed for, or be permitted to pay less than five hundred dollars ($500) for the unexpired portion of the fiscal year in which the domestic association is formed.